单击导航抽屉项目时，新活动无法启动

Question

我已经搜索了很多，尝试了所有我通过stackoverflow解决的问题，但是没有任何帮助。 请告诉我我在代码中犯了什么错误，或者我还有什么遗漏。 请帮助我。任何纠正都是可以理解的。 谢谢

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
            this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
   //    drawer.setDrawerListener(toggle);
    drawer.addDrawerListener(toggle);
    toggle.syncState();

    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);


    listView = (ListView) findViewById(R.id.list);
    adapter = new Adapter(this, list);
    listView.setAdapter(adapter);
}

    @Override
    public void onBackPressed() {
        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        if (drawer.isDrawerOpen(GravityCompat.START)) {
            drawer.closeDrawer(GravityCompat.START);
        } else {
            super.onBackPressed();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @SuppressWarnings("StatementWithEmptyBody")
    @Override
    public boolean onNavigationItemSelected(MenuItem item) {
        // Handle navigation view item clicks here.
        int id = item.getItemId();
        switch (id) {
            case R.id.nav_camera:
                //Do some thing here
                // add navigation drawer item onclick method here
                Intent i = new Intent(MyBookings.this, Categories.class);
                startActivity(i);
                break;
            case R.id.nav_gallery:
                //Do some thing here
                // add navigation drawer item onclick method here
                break;
            case R.id.nav_slideshow:
                //Do some thing here
                // add navigation drawer item onclick method here
                break;
            case R.id.nav_share:
                //Do some thing here
                // add navigation drawer item onclick method here
                break;
            case R.id.nav_send:
                //Do some thing here
                // add navigation drawer item onclick method here
                break;
        }

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        drawer.closeDrawer(GravityCompat.START);
        return false;
    }
}

Answer 1

我遇到了完全相同的问题，我通过添加以下内容进行修复：

navigationView.bringToFront();

对于您的情况，在初始化navigationView之后添加它：

NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.bringToFront();

Answer 2

尝试更改方法的布尔返回值：

@SuppressWarnings("StatementWithEmptyBody")
    @Override
    public boolean onNavigationItemSelected(MenuItem item) {
        // Handle navigation view item clicks here.
        int id = item.getItemId();
        switch (id) {
            case R.id.nav_camera:
                //Do some thing here
                // add navigation drawer item onclick method here
                Intent i = new Intent(MyBookings.this, Categories.class);
                startActivity(i);
                break;
            case R.id.nav_gallery:
                //Do some thing here
                // add navigation drawer item onclick method here
                break;
            case R.id.nav_slideshow:
                //Do some thing here
                // add navigation drawer item onclick method here
                break;
            case R.id.nav_share:
                //Do some thing here
                // add navigation drawer item onclick method here
                break;
            case R.id.nav_send:
                //Do some thing here
                // add navigation drawer item onclick method here
                break;
        }

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        drawer.closeDrawer(GravityCompat.START);
        return true;
    }

Answer 3

尝试此更改：：

Intent i = new Intent(MyBookings.this, Categories.class);
startActivity(i);
finish();

Answer 4

只需从Switch语句的末尾删除这两行

DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);

让我知道是否有帮助

Answer 5

更改return true。并在switch语句之前添加导航抽屉行

  @Override
        public boolean onNavigationItemSelected(MenuItem item) {
            // Handle navigation view item clicks here.

            DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
            drawer.closeDrawer(GravityCompat.START);

            int id = item.getItemId();
            switch (id) {
                case R.id.nav_camera:
                    //Do some thing here
                    // add navigation drawer item onclick method here
                    Intent i = new Intent(MyBookings.this, Categories.class);
                    startActivity(i);
                    break;
                case R.id.nav_gallery:
                    //Do some thing here
                    // add navigation drawer item onclick method here
                    break;
                case R.id.nav_slideshow:
                    //Do some thing here
                    // add navigation drawer item onclick method here
                    break;
                case R.id.nav_share:
                    //Do some thing here
                    // add navigation drawer item onclick method here
                    break;
                case R.id.nav_send:
                    //Do some thing here
                    // add navigation drawer item onclick method here
                    break;
            }
               return true;
        }
    }